kaia_isContractAccount - Kaia

Example code for the kaia_isContractAccount JSON RPC method. Complete guide on how to use kaia_isContractAccount JSON RPC in GetBlock Web3 documentation.

This method returns true if the address is a Smart Contract Account and false if it is an Externally Owned Account. It reflects Kaia's explicit account-type model rather than inferring contract status from code length.

Parameters

Parameter	Type	Required	Description
address	string	Yes	20-byte account address
block	string	Yes	Block number in hex, or "latest", "earliest", "pending"

Request

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "kaia_isContractAccount",
    "params": ["0x19aac5f612f524b754ca7e7c41cbfa2e981a4432", "latest"],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'kaia_isContractAccount',
    params: ["0x19aac5f612f524b754ca7e7c41cbfa2e981a4432", "latest"],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'kaia_isContractAccount',
        'params': ["0x19aac5f612f524b754ca7e7c41cbfa2e981a4432", "latest"],
        'id': 'getblock.io'
    }
)

print(response.json())

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "kaia_isContractAccount",
            "params": ["0x19aac5f612f524b754ca7e7c41cbfa2e981a4432", "latest"],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": true
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	boolean	true for a Smart Contract Account, false for an EOA

Use Cases

• Contract Detection: Confirm an address is a contract before calling it

• Wallet UX: Warn users before sending assets to a contract

• Indexing: Classify addresses by account type

• Validation: Gate logic on whether a target is a contract

Error Handling

Error Code	Message	Description
-32602	Invalid params	A parameter is missing or has the wrong type or format
-32000	Not found	The account or block does not exist in the requested state
-32603	Internal error	The node failed to process the request

Web3 Integration

Ethers.js

ethers-example.js

const { ethers } = require('ethers');

const provider = new ethers.JsonRpcProvider('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

const isContract = await provider.send('kaia_isContractAccount', ['0x19aac5f612f524b754ca7e7c41cbfa2e981a4432', 'latest']);
console.log(isContract);

Viem

viem-example.js

import { createPublicClient, http } from 'viem';
import { kaia } from 'viem/chains';

const client = createPublicClient({ chain: kaia, transport: http('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/') });

const isContract = await client.request({
    method: 'kaia_isContractAccount',
    params: ['0x19aac5f612f524b754ca7e7c41cbfa2e981a4432', 'latest']
});
console.log(isContract);